2N Analogue UMTS gateway 2N SmartGate UMTS - Manual, 1699 v1.1.0 - Manual (Page 80)

List of Abbreviations 6.3
80
n SMS (Short Message Service)
A term for the system and one unit (message).
n SW
Software.
n TTL (Transistor-Transistor Logic)
A standard digital technology defining voltage for levels 0 and 1.
n PSTN
Public Switched Telephone Network
n UMTS (Universal Mobile Telecommunications System)
n WCDMA
Wideband Code Division Multiple Access – technology of wireless transmitting
in UMTS network, allows higher data transmit rate than